Smart pricing affects the whole account (not just a page or one site individually).

One poorly converting site can trigger smart pricing even if the site is unrelated to other sites in your account.

Smart pricing is tracked with a 30 day cookie - which might account for reports from some publishers of smart pricing "kicking in" 3-4 weeks after making major changes to their sites/pages with Adsense.

It's nice to know that it's possible to reverse the effects of smart pricing by removing poorly performing sites, but again this idea needs testing to see what effect removing poorly performing sites.

And anyway, what _is_ a poorly performing conversion? Do we gauge poor conversion using CTR? That's not the same thing as conversions. From the AdSense Publishers perspective, we don't have the tools to know if our ads are converting well. What if someone clicks thru fine, but doesn't buy a thing on the Adwords' Advertisers sites? I have no way of knowing that information except to rely on Google - who has the data on conversions to some extent - to make the call (and hope it's fair).

Guess if my revenues drop noticeably then I am to assume that my sites aren't converting....? Not an easy way to figure out what's wrong and try to fix it.